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[Fx,Fy] = <a href="%pathto:misc.vl_grad;">VL_GRAD</a>(F) returns the finite differencies gradient of the
image F. The function uses central differencies and for all but
the boundaries pixels, for which it uses forward/backward
differencies as appropriate.
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<a href="%pathto:misc.vl_grad;">VL_GRAD</a>(F,'forward') uses only forward differencies (except on the
lower and right boundaries, where backward difference is used).
Similarly, <a href="%pathto:misc.vl_grad;">VL_GRAD</a>(F,'backward') uses only backward differencies.
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See also: GRADIENT(), <a href="%pathto:vl_help;">VL_HELP</a>().
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